//console.log('hello');

// console.log(Date);
// console.log(Math);

// console.log(setTimeout);
// console.log(setInterval);
// console.log(setImmediate);
// console.log(requestAnimationFrame); node中无法读取 

//操作文件
// console.log(__filename);
// console.log(__dirname);

//进程
console.log(process);